root/arch/csky/abiv1/cacheflush.c

DEFINITIONS

1. flush_dcache_page
2. update_mmu_cache
3. flush_kernel_dcache_page
4. flush_cache_range

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
   3 
   4 #include <linux/kernel.h>
   5 #include <linux/mm.h>
   6 #include <linux/fs.h>
   7 #include <linux/syscalls.h>
   8 #include <linux/spinlock.h>
   9 #include <asm/page.h>
  10 #include <asm/cache.h>
  11 #include <asm/cacheflush.h>
  12 #include <asm/cachectl.h>
  13 
  14 #define PG_dcache_clean         PG_arch_1
  15 
  16 void flush_dcache_page(struct page *page)
  17 {
  18         struct address_space *mapping;
  19 
  20         if (page == ZERO_PAGE(0))
  21                 return;
  22 
  23         mapping = page_mapping_file(page);
  24 
  25         if (mapping && !page_mapcount(page))
  26                 clear_bit(PG_dcache_clean, &page->flags);
  27         else {
  28                 dcache_wbinv_all();
  29                 if (mapping)
  30                         icache_inv_all();
  31                 set_bit(PG_dcache_clean, &page->flags);
  32         }
  33 }
  34 EXPORT_SYMBOL(flush_dcache_page);
  35 
  36 void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr,
  37         pte_t *ptep)
  38 {
  39         unsigned long pfn = pte_pfn(*ptep);
  40         struct page *page;
  41 
  42         if (!pfn_valid(pfn))
  43                 return;
  44 
  45         page = pfn_to_page(pfn);
  46         if (page == ZERO_PAGE(0))
  47                 return;
  48 
  49         if (!test_and_set_bit(PG_dcache_clean, &page->flags))
  50                 dcache_wbinv_all();
  51 
  52         if (page_mapping_file(page)) {
  53                 if (vma->vm_flags & VM_EXEC)
  54                         icache_inv_all();
  55         }
  56 }
  57 
  58 void flush_kernel_dcache_page(struct page *page)
  59 {
  60         struct address_space *mapping;
  61 
  62         mapping = page_mapping_file(page);
  63 
  64         if (!mapping || mapping_mapped(mapping))
  65                 dcache_wbinv_all();
  66 }
  67 EXPORT_SYMBOL(flush_kernel_dcache_page);
  68 
  69 void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
  70         unsigned long end)
  71 {
  72         dcache_wbinv_all();
  73 
  74         if (vma->vm_flags & VM_EXEC)
  75                 icache_inv_all();
  76 }